How does the respiratory system in birds differ from the mammalian respiratory system? The
respiratory system in birds allows exchange of fresh air and stale air In one breath, whereas the
mammalian system requires two breaths for this exchange. The respiratory system In birds Is
less efficient than the mammalian respiratory system. The respiratory system in birds is
unidirectional, whereas the mammalian respiratory system is bidirectional. The respiratory
system in birds uses air sacs in place of the lungs found in the mammalian respiratory system.
What is the function of the air sacs in the respiratory system of birds? To allow mixing of fresh
and stale air so that the oxygen/carbon dioxide ratio is optimal To hold air before and after It
passes through the lungs so that It moves In one direction To provide a site for gas exchange
between the blood and the surrounding air To provide a storage site for holding fresh air that can
be drawn from during periods of high metabolic demand.
Solution
2. C is the correct answer.
Explanation: in mammals the flow of air id bidirectional or it flows into lungs and again come
out of the lungs. But in birds the flow is unidirectional. They require two cycles to move air
tthrough respiratory system.
The gas exchange takes place in the walls of microscopic tubules called \' air capillaries\'.
3. B is correct.
Explanation: birds do not have diaphragm like mammals. They have air sacs within body cavities
which create unidirectional flow of air to supply more oxygen to body. They do not have
capability of gaseous exchange..
How does the respiratory system in birds differ from the mammalian re.pdf
1. How does the respiratory system in birds differ from the mammalian respiratory system? The
respiratory system in birds allows exchange of fresh air and stale air In one breath, whereas the
mammalian system requires two breaths for this exchange. The respiratory system In birds Is
less efficient than the mammalian respiratory system. The respiratory system in birds is
unidirectional, whereas the mammalian respiratory system is bidirectional. The respiratory
system in birds uses air sacs in place of the lungs found in the mammalian respiratory system.
What is the function of the air sacs in the respiratory system of birds? To allow mixing of fresh
and stale air so that the oxygen/carbon dioxide ratio is optimal To hold air before and after It
passes through the lungs so that It moves In one direction To provide a site for gas exchange
between the blood and the surrounding air To provide a storage site for holding fresh air that can
be drawn from during periods of high metabolic demand.
Solution
2. C is the correct answer.
Explanation: in mammals the flow of air id bidirectional or it flows into lungs and again come
out of the lungs. But in birds the flow is unidirectional. They require two cycles to move air
tthrough respiratory system.
The gas exchange takes place in the walls of microscopic tubules called ' air capillaries'.
3. B is correct.
Explanation: birds do not have diaphragm like mammals. They have air sacs within body cavities
which create unidirectional flow of air to supply more oxygen to body. They do not have
capability of gaseous exchange.
